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Sporopollen Assemblages from the Cretaceous Yimin Formation of the Hailar Basin,Inner Mongolia,China 被引量:11
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作者 WAN Chuanbiao QIAO Xiuyun +5 位作者 XU Yanbin SUN Yuewu REN Yanguang JIN Yudong GAO Ping LIU Tongyan 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2005年第4期459-470,共12页
Three sporopollen assemblages are recognized for the first time from the Cretaceous Yimin Formation in the Hailar Basin of eastern Inner Mongolia. They are (in ascending order): the lmpardecispora-Aequitriradites- ... Three sporopollen assemblages are recognized for the first time from the Cretaceous Yimin Formation in the Hailar Basin of eastern Inner Mongolia. They are (in ascending order): the lmpardecispora-Aequitriradites- Clawttipollenites assemblage; the Triporoletes-Pilosisporites-Asteropollis assemblage; and the Appendicisporites- Asteropollis-Tricolpites assemblage, distributed in Members 1, 2 and 3 of the Yimin Formation respectively. Recognition of this biostratigraphic sequence is very important for the division and correlation of the Yimin Formation in the basin. Meanwhile, the age of the Yimin Formation is considered to be Barremian to Early Albian based on the palynological data. 展开更多
关键词 CRETACEOUS Barremian-Early Albian sporopollen assemblage ANGIOSPERMS Hailar Basin Inner Mongolia
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The characteristic and evolution of coal-forming swamp in Hanshuiquan district,Santanghu Coalfield, Xinjiang,NW China,during the Middle Jurassic: evidence from coal petrography,coal facies and sporopollen 被引量:10
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作者 Shuo Feng Jing He +2 位作者 Jijun Tian Xingyu Lu Bo Yang 《International Journal of Coal Science & Technology》 EI 2019年第1期1-14,共14页
Santanghu Coalfield is the largest integrated coalfield exploration area in China. The major coal seams developing in Xishanyao Formation (Middle Jurassic) are the high-quality steam coals characterized by large thick... Santanghu Coalfield is the largest integrated coalfield exploration area in China. The major coal seams developing in Xishanyao Formation (Middle Jurassic) are the high-quality steam coals characterized by large thickness, favorable horizontal continuity and high coal quality. In this paper, twenty-two samples were collected from the three typical boreholes in Hanshuiquan disirict, representing the 11 coal seam sequences (7#,8#,9#,13#, 14#,15#,17#,18#,19#,20#,22#), respectively. The petrographic characteristics of the coal-bearing sequence in Xishanyao Formation were firstly summarized systematicly, and then the coal-forming swamp characteristics and succession mechanism of the coal seam in Xishanyao Formation were defined by analyzing the samples. The maceral composition, structure, geochemical and geophysical characteristics of coal are in eluded in original genetic criteria of coal-forming swamp an alysis. And the composition of coal petrography, maceral and microlithotype are the most frequently used parameters. Coal is composed of microscopic constituents and inorganic substances. The Xishanyao Formation maceral mainly consists of vitrinite (65.74%-97.01 %), inert i nite (1.93%-34%), and the exinite shows the mode of regular change. The coal-forming swamp in Xishanyao Formation possesses the characteristics of mainly marsh, wet forest swamp facies, and shallow water covered forest swamp facies, and a few of coal seams distribute in the deep water covered forest swamp facies. In addition, the sporopollens in Xishanyao Formation are mainly Pinaceae evergreen broad leaf and needle-leaved plants. Osmundaceae, Cyatheaceae and Lygodiaceae, indicating that the warm and humid tropic-subtropical climate conductive to the persistent growth of coal-forming plants in the Middle Jurassic. The coal-forming swamp shows the characteristics of vertically upward fluctuation through the periodic transition. It indicates a shallow-deep-shallow change process of the water covered depth in the swamp. This is the prin ci pal factor for the formation of the high-quality and continuous coal seam in Hanshuiquan district, Santanghu Coalfield. 展开更多
关键词 Santanghu Coalfield Xishanyao Formation Coal-forming SWAMP sporopollen
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GEOLOGICAL SIGNIFICANT OF SPOROPOLLEN ASSEMBLAGE IN THE XUESHAN FORMATION
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作者 Shi He,Wang Chengshan, Ma Runze,Wei Xiangui,Li Xianghui,Li Yong(Chengdu Institute of Technology, Chengdu 610059, China) 《地学前缘》 EI CAS CSCD 2000年第S1期151-151,共1页
The Xueshan Formation is a set of red coarse clastic deposit of land facies consisting mainly of lithic sandstone, pebbled sandstone, conglomerate, intercalated with siltstone and mudstone. It is distributed in the ea... The Xueshan Formation is a set of red coarse clastic deposit of land facies consisting mainly of lithic sandstone, pebbled sandstone, conglomerate, intercalated with siltstone and mudstone. It is distributed in the eastern part of north Qiangtang Basin, and overlies conformably the Suowa Formation bearing marine fossils. It is very difficult to find valuable fossils from the Xueshan Formation excepting rare bivalve fragments and prints.We collected a few spore and pollen samples from the middle part of the Xueshan Formation in Tuonamulematianbao section, Shuanghu, in 1997, when we made geological survey for petroleum and nature gas. Some fossils of spore and pollen were obtained from these samples. They are: Cyathidites minor, Toroisporis sp .., Todisporites minor, Lygodiumsporites subsimplex, Cicatricosisporites ludbrooki, C. sp ., Psophosphaera sp ., Chasmatosporites minor, Classopollis annulatus, C. clssoiddes, C. minor, Cerebrropollenites carlylensis, Callialasporites dampieri, Quadraeculina anellaeformis, Pseudopicea variabiliformis. 展开更多
关键词 Northern QIANGTANG Xueshan FORMATION sporopollen ASSEMBLAGE diachronous OXFORDIAN UPLIFTING
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Reconstruction Paleoclimate Dased on Sporopollen Record of Re'nacuo Lake,Tibet
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作者 LI Hanshi WANG Genhou +3 位作者 YUAN Guoli FANG Bin LUO Tongwei YANG Yongqiang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第4期1239-1251,共13页
The sedimentary sequences since 33 ka B.P. to 10 ka B.P. have been established in the Re'nacuo-Lake, Gaize area of north Tibet, through a study of a lacustrine section. The climate since 33 ka B.P. to 10 ka B.P. may ... The sedimentary sequences since 33 ka B.P. to 10 ka B.P. have been established in the Re'nacuo-Lake, Gaize area of north Tibet, through a study of a lacustrine section. The climate since 33 ka B.P. to 10 ka B.P. may be divided into two cycle include 5 dry phases and 5 moist phases from reconstructing the paleoclimate through a study of sporopollen analysis. It mainly reflects the general regularity of global climatic change through contrasting with the pale environment in northern hemisphere. Our pollen record reveals a regional climate history similar to those from the neighboring sites, including the GISP2, the Guliya ice core and core RM in Zoige, and thus supports the notion that the Qinghai-Tibetan Plateau acts as an important link between climatic events in the North Atlantic realm and the Asian monsoon domain. The response of the Qinghai-Tibet Plateau to the global climatic change is relatively sensitive. 展开更多
关键词 TIBET lacustrine deposit terrace sporopollen PALEOCLIMATE climate change
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Quaternary Sporopollen Records and Environmental Evolution in the Dalangtan of Qaidam Basin
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作者 YANG Zhenjing YANG Qinghua +3 位作者 ZHEN Mianping HOU Xianhua BI Zhiwei LIU Linjing 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期440-440,共1页
Since the Quaternary,very thick lacustrine sediments have been deposited in Dalangtan of Qaidam Basin.Based on a study of high-resolution sporopollen analysis on the Dalangtan ZK06 drilling,and paleomagnetic dating
关键词 sporopollen assemblage Climatic cycles Uplift of Tibetan Plateau Dalangtan Qaidam Basin
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张掖盆地晚更新世至中全新世气候变化:孢粉学和重矿物学证据
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作者 赵淼 龚磊 +5 位作者 吴玺 蔡五田 张文卿 安永会 李康 刘作鹏 《西北地质》 CAS CSCD 北大核心 2024年第2期230-243,共14页
为确定张掖盆地晚第四纪沉积地层时代和探讨其蕴含的古气候信息,笔者利用孢粉分析、重矿物分析、光释光测年等方法对研究区晚更新世以来气候变化特征进行了重建,并确认了当地全新世和晚更新世地层界限。结果表明:地层自下而上划分为4个... 为确定张掖盆地晚第四纪沉积地层时代和探讨其蕴含的古气候信息,笔者利用孢粉分析、重矿物分析、光释光测年等方法对研究区晚更新世以来气候变化特征进行了重建,并确认了当地全新世和晚更新世地层界限。结果表明:地层自下而上划分为4个孢粉组合带和植被类型及气候特征:①深度为56.8~26.4 m,年龄为112.7~63.3 ka,属末次间冰期,粉组合为松–板栗–藜–菊–蒿,针阔叶混交林草原植被,为晚更新世温暖较湿润气候。②深度为26.4~2.6 m,年龄为63.3~11.8 ka,与末次冰期相当,孢粉组合为松–麻黄–藜–蒿,植被类型为针阔叶混交林草原植被,为晚更新世干燥寒冷气候。③深度为2.6~0.8 m,年龄为11.8~8.9 ka,全新世早期,孢粉组合为松–藜–蒿,稀树针阔叶混交林草原植被,较凉较干气候。④深度为0.8~0.15 m,年龄为8.9~7.8 ka,全新世早期向中期过渡期,孢粉组合为松–藜–菊–蒿,稀树针阔叶混交林草原植被,为温暖较干气候。孢粉组合所揭示的晚更新世—中全新世气候变化特征,对于揭示张掖盆地甚至西北干旱区的古气候变化具有重要意义。 展开更多
关键词 张掖盆地 古气候 冰期 孢粉分析 重矿物
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典型岩溶高原边缘夷平面沉积特征及古气候环境——以湘西洛塔及贾坝剖面为例
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作者 吴亮君 王璞珺 +5 位作者 张晶 辛存林 容悦冰 陈伟海 张远海 黄超 《中国岩溶》 CAS CSCD 北大核心 2024年第2期239-271,共33页
文章对云贵高原边缘洛塔期(洛塔剖面)和召市期(贾坝剖面)夷平面风化壳进行粒度、磁化率、孢粉等方面的研究,探索其沉积特征及古气候响应。结果显示:洛塔剖面和贾坝剖面风化壳都以黏土和不等粒砂为主,但洛塔剖面岩性和粒度变化比较明显,... 文章对云贵高原边缘洛塔期(洛塔剖面)和召市期(贾坝剖面)夷平面风化壳进行粒度、磁化率、孢粉等方面的研究,探索其沉积特征及古气候响应。结果显示:洛塔剖面和贾坝剖面风化壳都以黏土和不等粒砂为主,但洛塔剖面岩性和粒度变化比较明显,为杂色黏土质粉砂和粉砂质黏土互层,夹一层砂砾石;贾坝剖面岩性和粒度相对稳定,主要为粉砂黏土。洛塔剖面Mz、Md、SC/D值以及磁化率值整体较高,但变化幅度小且快,贾坝剖面Mz、Md、SC/D值以及磁化率值相对波动较大,由此推断两条剖面所揭示的沉积环境都整体湿润,但贾坝剖面显示出小的干燥波动,即洛塔期夷平面风化壳沉积时期气候为温暖湿润型,召市期夷平面风化壳沉积时期气候为温凉干燥型,这与孢粉中大量水龙骨属(Polypodium)、松属(Pinus)指代的气候意义相同。对比孢粉组合及前人资料,推测洛塔剖面风化壳可能为新近纪早期开始形成,该夷平面可能形成于中新世,而贾坝剖面可能形成于第四纪早期,该夷平面可能形成于更新世。 展开更多
关键词 湘西世界地质公园 夷平面 古气候 粒度 磁化率 孢粉
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鄂尔多斯盆地盐池地区延安组孢粉组合的发现及其古气候意义
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作者 何发岐 张森 +5 位作者 姜志超 杨兵 袁琼 巩雪娇 郭彩清 曹晶 《地质学报》 EI CAS CSCD 北大核心 2024年第1期200-213,共14页
为恢复鄂尔多斯盆地盐池地区早—中侏罗世古气候,重建古环境,对宁东2井进行孢粉分析和黏土矿物测试,建立孢粉组合、孢粉谱。延安组下部为Inaperturopollenites-Psophosphaera-Protopinus组合,地质年代为早侏罗世托阿尔期晚期;延安组上部... 为恢复鄂尔多斯盆地盐池地区早—中侏罗世古气候,重建古环境,对宁东2井进行孢粉分析和黏土矿物测试,建立孢粉组合、孢粉谱。延安组下部为Inaperturopollenites-Psophosphaera-Protopinus组合,地质年代为早侏罗世托阿尔期晚期;延安组上部为Cyathidites-Deltoidospora-Cycadopites组合,地质年代为中侏罗世早期,下/中侏罗统界线位于钻孔2144.5~2153.0 m之间。据孢粉谱建立的古气候和古植被得出,早侏罗世托阿尔期晚期为暖温带半湿润型气候,植被类型为针叶林,中侏罗世早期总体为亚热带湿润型,植被面貌有早期的针阔叶混交林-草丛型向晚期的针叶林-稀草型转变。两组合总体上反映的早侏罗世托阿尔期晚期至中侏罗世早期湿度由半湿润向湿润转变,温度由低向高转变,孢粉谱所指示的气候变化趋势与黏土矿物指标所反映的气候变化趋势一致。气候的转变对该地区聚煤作用有着明显的促进作用。 展开更多
关键词 鄂尔多斯盆地 延安组 孢粉组合 黏土矿物 古气候
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缅甸英雄岛始新世孢粉组合及其古环境意义
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作者 史德锋 祝幼华 《石油实验地质》 CAS CSCD 北大核心 2024年第1期136-145,共10页
为配合中缅合作的M区块油气勘探,确定该区块英雄岛含油气地层时代与沉积环境,对缅甸英雄岛R-3井2562~2844 m井段10个烃源岩样品进行了孢粉实验分析。通过观察,在每个样品中均发现了较丰富的孢粉化石,共鉴定出85属135种或未定种。该井段... 为配合中缅合作的M区块油气勘探,确定该区块英雄岛含油气地层时代与沉积环境,对缅甸英雄岛R-3井2562~2844 m井段10个烃源岩样品进行了孢粉实验分析。通过观察,在每个样品中均发现了较丰富的孢粉化石,共鉴定出85属135种或未定种。该井段的孢粉化石以Momipites和Quercoidites含量丰富,始新世常见分子Sabalpolllenites areolatus断续出现,并见有特征分子Schizaeoisporites eocenicus为主要特征,根据孢粉特征分子和优势属种的分布规律,命名为Schizaeoisporites eocenicus-Quercoidites-Momipites-Sabalpollenites areolatus组合;对比相同井段有孔虫和钙质超微化石的分布时代,推测当前的孢粉组合时代为中晚始新世。依据孢粉组合面貌,对照我国油气区古近纪—新近纪孢粉序列的数据统计结果,系统研究后所建立的划分孢粉植物类型、气温带和干湿度带的3个模式,并结合本钻井其他孢型化石分布特征,认为研究区中晚始新世地层为近海陆地环境,北亚热带、暖温带湿润型古气候沉积。 展开更多
关键词 孢粉组合 古环境 中晚始新世 英雄岛 缅甸
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海洋沉积证据在低纬过程气候变化中的应用及展望
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作者 罗传秀 王晓静 +6 位作者 苏翔 马婷 杨艺萍 杜恕环 杨子杰 孙玉慧 梁诗晴 《海洋地质前沿》 CSCD 北大核心 2024年第2期1-10,共10页
在国内外研究的基础上,对印太暖池区的沃克环流和厄尔尼诺-南方涛动(ENSO)、热带辐合带(ITCZ)等低纬过程的空间分布和随时间的变化规律及其研究方法进行初步归纳,并指出研究中存在的问题。本文论述了厄尔尼诺-南方涛动变率在全新世早期... 在国内外研究的基础上,对印太暖池区的沃克环流和厄尔尼诺-南方涛动(ENSO)、热带辐合带(ITCZ)等低纬过程的空间分布和随时间的变化规律及其研究方法进行初步归纳,并指出研究中存在的问题。本文论述了厄尔尼诺-南方涛动变率在全新世早期及中世纪气候异常期(1 000~700 a BP)的晚期逐渐增强,介绍了热带辐合带在BA暖期(B?llingAller?d Warm Period)和前北方期(pre-Boreal,10.3~9.5 ka BP)的北移,以及在新仙女木事件(Younger Dryas Event,12.5~11.5 ka BP)和北大西洋冷期(距今7.5~5 ka BP)期间的南移。对低纬过程长时间尺度轨道周期的探讨表明,末次冰盛期赤道东太平洋出现了较偏南的热带辐合带锋面系统,甚至在1.65 Ma冰期,热带辐合带也有快速南移的证据。海洋沉积的粒度、黏土矿物、陆源粉尘、元素和同位素、有孔虫分析等研究方法在推测厄尔尼诺-南方涛动和热带辐合带位移中有很好的应用,建议以陆源生态系统对气候的响应为切入点、以孢粉为手段来探讨陆源植被、气候、火灾和海-陆大气环流等低纬过程的变化特征,进而反演沃克环流(或厄尔尼诺-南方涛动)演化和热带辐合带位移的影响。 展开更多
关键词 暖池区 地质时期 厄尔尼诺-南方涛动 热带辐合带 孢粉
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鄂尔多斯盆地下侏罗统富县组孢粉植物群对Jenkyns事件的响应
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作者 韦一 南青民 +3 位作者 杨兵 张新智 孙思远 苏桂芬 《地质学报》 EI CAS CSCD 北大核心 2024年第10期3017-3030,共14页
为研究Jenkyns事件对内陆盆地古气候的影响,通过对鄂尔多斯盆地南部富县组孢粉鉴定、分析,划分出3个孢粉组合,由下至上:①Cyathidites-Deltoidospora-Chasmatosporites组合,地质年代为早侏罗世普林斯巴期;②Classopollis-Quadraeculina-... 为研究Jenkyns事件对内陆盆地古气候的影响,通过对鄂尔多斯盆地南部富县组孢粉鉴定、分析,划分出3个孢粉组合,由下至上:①Cyathidites-Deltoidospora-Chasmatosporites组合,地质年代为早侏罗世普林斯巴期;②Classopollis-Quadraeculina-Chasmatosporites组合,地质时代为早侏罗世托阿尔期早—中期,与Jenkyns事件发生的时间一致;③Cyathidites-Cycadopites-Psophosphaera组合,地质时代为早侏罗世托阿尔期晚期。孢粉群落反映的古气候信息显示:早侏罗世鄂尔多斯盆地经历了由亚热带湿润性气候→亚热带半湿润半干旱型气候→亚热带湿润性气候的转变。与前人在特提斯洋和泛大洋区域研究所得出的结论不同的是,Jenkyns事件在鄂尔多斯盆地(亚欧大陆腹地)表现为趋干趋热事件。 展开更多
关键词 托阿尔期 富县组 孢粉 Jenkyns事件 鄂尔多斯盆地
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内蒙古西乌旗地区中——晚更新世孢粉记录及其古气候意义
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作者 杨兵 陈喜庆 +2 位作者 葛天助 韦一 刘迁 《地质通报》 CAS CSCD 北大核心 2024年第6期1047-1058,共12页
为重建内蒙古西乌旗地区巴音华盆地中—晚更新世之交古气候,探讨其变化规律及对全球古气候的响应,对该盆地ZK03钻孔和ZK04钻孔孢粉化石进行系统鉴定,利用有序聚类分析划分孢粉组合,结合共存因子分析法对孢粉组合定量化建立研究区的古气... 为重建内蒙古西乌旗地区巴音华盆地中—晚更新世之交古气候,探讨其变化规律及对全球古气候的响应,对该盆地ZK03钻孔和ZK04钻孔孢粉化石进行系统鉴定,利用有序聚类分析划分孢粉组合,结合共存因子分析法对孢粉组合定量化建立研究区的古气候参数值。鉴定出孢粉68个科属,自下而上划分出(Ⅰ)松属(Pinus)-桦属(Betula)-香蒲属(Typha)孢粉组合;(Ⅱ)栎属(Quercus)-麻黄属(Ephedra)-蒿属(Artemisia)孢粉组合;(Ⅲ)莎草科(Cyperaceae)-香蒲属(Typha)-水龙骨科(Polypodiaceae)孢粉组合。其中,组合Ⅰ、组合Ⅱ时代为中更新世,组合Ⅲ时代为晚更新世。植被类型经历了阔叶林-草原型兼有少量针叶林→阔叶林-草原型→稀树-草原型的转变。古气候经历了由相对温暖的湿润型气候到相对温凉的半干旱型气候再到相对温暖的湿润型气候的3期转变,各期分别对应的年均气温和年降雨量在数值上也体现了由高到低再到高的变化过程。其中,在中更新世/晚更新世之交,气候经历由凉到温的变化趋势,与格陵兰冰芯氧同位素所指示的全球平均温度变化趋势相耦合。 展开更多
关键词 西乌旗 更新世 孢粉组合 古气候 地质调查工程 共存因子分析
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河北平原北部蓟州区西南头营剖面地层沉积特征与沉积环境研究
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作者 石光耀 张运强 +6 位作者 张欢 潘志龙 李庆喆 张金龙 张鹏程 吕可欣 闫皓 《地质论评》 CAS CSCD 北大核心 2024年第6期2113-2126,共14页
笔者等通过详细测量河北平原北部天津市蓟州区西南部桑梓镇头营剖面,结合粒度分析数据、孢粉分析数据、^(14)C和光释光测年数据,系统分析了该剖面地层形成年龄和沉积特征。实测剖面显示地层可以划分为18层,沉积物以黏土质粉砂、粉砂质... 笔者等通过详细测量河北平原北部天津市蓟州区西南部桑梓镇头营剖面,结合粒度分析数据、孢粉分析数据、^(14)C和光释光测年数据,系统分析了该剖面地层形成年龄和沉积特征。实测剖面显示地层可以划分为18层,沉积物以黏土质粉砂、粉砂质黏土、黏土为主。^(14)C和光释光测年数据显示该剖面沉积物主要为晚更新世晚期以来沉积。粒度分析结果显示14个粒度样品频率分布曲线均为不对称的单峰态,表明沉积物成分单一,为相对稳定的水能条件下形成;概率累积曲线以细粒型为主,样品主要由跃移总体和悬浮总体组成。根据孢粉组合特征,可将剖面划分为3个孢粉带,孢粉带Ⅰ:气候温和湿润;孢粉带Ⅱ:气候寒冷干旱;孢粉带Ⅲ:气候温暖湿润。实测剖面测年结果与古里雅冰芯氧同位素曲线作对比可知,剖面形成时代对应MIS3~MIS1阶段,头营剖面经历了暖—冷—暖的气候变化,与孢粉组合反映的气候特征一致。综上可知,头营剖面晚更新世以来沉积物应属漫滩或洼地相沉积,整体处于相对稳定的低水流条件,沉积环境稳定。 展开更多
关键词 粒度特征 14C和光释光测年 孢粉组合 沉积环境 河北平原
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辽河平原东部黑土剖面孢粉组合及其时代和古气候意义
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作者 高远 周业泽 +4 位作者 秦天 侯红星 裴阳 寇福建 闫波 《地质与资源》 CAS 2024年第5期617-625,共9页
对辽河平原东部黑土剖面PM25中0~1 m开展孢粉分析,根据孢粉百分含量变化将化石自下而上划分为两个孢粉组合,其中PM25-1孢粉组合以Spiraea-Artemisia-Sanguisorba-Rosa-Echinate Asteraceae为主,气候由冷干向暖湿转变;PM25-2孢粉组合以Pi... 对辽河平原东部黑土剖面PM25中0~1 m开展孢粉分析,根据孢粉百分含量变化将化石自下而上划分为两个孢粉组合,其中PM25-1孢粉组合以Spiraea-Artemisia-Sanguisorba-Rosa-Echinate Asteraceae为主,气候由冷干向暖湿转变;PM25-2孢粉组合以Pinus-Cyperaceae-Chenopodium为主,指示了气候由暖湿向冷干转变.结合^(14)C测年数据,辽河平原东部黑土主要形成于1.355 ka以来的中世纪暖期. 展开更多
关键词 辽河平原 黑土 孢粉 古气候 全新世
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A 1.5 Ma sporopollen record of paleoecologic environment evolution in the central Chinese Loess Plateau 被引量:12
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作者 WUFuli FANGXiaomin +2 位作者 MAYuzhen ANZhisheng LIJijun 《Chinese Science Bulletin》 SCIE EI CAS 2004年第3期295-302,共8页
A 1.5 Ma sporopollen record was obtained from a continuous loess-paleosol sequence at Chaona in the central Chinese Loess Plateau. It shows that (1) arid herbs of largely Artemisia and Chenopodiaceae and arbors of mai... A 1.5 Ma sporopollen record was obtained from a continuous loess-paleosol sequence at Chaona in the central Chinese Loess Plateau. It shows that (1) arid herbs of largely Artemisia and Chenopodiaceae and arbors of mainly Pinus, Betula and Quercus dominate loess and paleosol, respectively, reflecting cycles of cold-dry and warm-humid conditions of glaciation and interglaciation; (2) that similar vegetation pattern and cold-dry condition were found in times of unusual thick and coarse loesses L9 and L15, which have been regarded as two extremely cold and dry times as indicated by inorganic climatic proxies; and (3) that shifts of vegetations from earlier forest-steppe to open-forest and steppe and then to steppe were found at 0.95 and 0.5 Ma,implying a stepwise of drying of the Loess Plateau in the Quaternary. 展开更多
关键词 孢粉记录 古生态环境 环境演化 中国 黄土高原
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Sporopollen analysis of Core B10 in the southern Yellow Sea and the reflected characteristics of climate changes 被引量:6
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作者 FU Mingzuo~(1,2,3), LI Zhen~1, XU Xiaowei~1 & SHl Xuefa~1 1. Key Laboratory of Marine Sedimentology and Environmental Geology, First institute of Oceanography. State Oceanic Administration, Qingdao 266061. China 2. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071. China 3. Graduate School, Chinese Academy of Sciences, Beijing 100039. China 《Chinese Science Bulletin》 SCIE EI CAS 2003年第B06期42-48,共7页
Eight sporopollen zones have been divided based on the results of high-resolution sporopollen analysis of Core B10 in the southern Yellow Sea. Based on the results along with ^14C datings and the subbottom profiling d... Eight sporopollen zones have been divided based on the results of high-resolution sporopollen analysis of Core B10 in the southern Yellow Sea. Based on the results along with ^14C datings and the subbottom profiling data,climatic and environmental changes since the last stage of late Pleistocene are discussed. The main conclusions are drawn as follows: (1) the vegetation evolved in the process of coniferous forest-grassland containing broad-leaved trees→coniferous and broad-leaved mixed forest→coniferons and broad-leaved mixed forest-grassland prevailed by coniferous trees→coniferous and broad-leaved mixed forest-grassland containing evergreen broad-leaved trees→coniferons and broad-leaved mixed forest-grassland prevailed by broadleaved trees→deciduous broad-leaved forest-meadow containing evergreen broad-leaved trees→coniferous and broadleaved mixed forest-grassland prevailed by broad-leaved trees→coniferous and broad-leaved mixed forest containing evergreen broad-leaved trees; (2) eight stages of climate changes are identified as the cold and dry stage, the temperate and wet stage, the cold and dry stage, the warm and dry stage, the temperate and wet stage, the hot and dry stage, the temperate and dry stage, then the warm and dry stage in turn; (3) the sedimentary environment developed from land,to littoral zone, to land again, then to shore-neritic zone; and (4) the Yellow Sea Warm Current formed during early-Holocene rather than Atlantic stage. 展开更多
关键词 中国 黄海 气候变化 碳14年代测定 底基压型数据 更新世 沉积环境 大西洋
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Environmental indicators from comparison of sporopollen in early Pleistocene lacustrine sediments from different climatic zones 被引量:4
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作者 WU FuLi FANG XiaoMin +1 位作者 MIAO YunFa DONG Ming 《Chinese Science Bulletin》 SCIE EI CAS 2010年第26期2981-2988,共8页
Two lacustrine sporopollen records obtained from the Qaidam Basin (in the non-monsoonal region) and the Linxia Basin (in the monsoonal transition zone) indicate that during the early Pleistocene open forest-steppe/ste... Two lacustrine sporopollen records obtained from the Qaidam Basin (in the non-monsoonal region) and the Linxia Basin (in the monsoonal transition zone) indicate that during the early Pleistocene open forest-steppe/steppe vegetation developed in the Qaidam Basin, while in the Linxia Basin an open cypress forest-steppe shifted to a conifer/conifer-steppe and then to open forest-steppe vegetation. Existing sporopollen records from the Chinese Loess Plateau (CLP) (in the monsoonal region) indicate that around the Sanmen Paleolake open forest-steppe shifted to pine/conifer-broadleaved mixed forest. The conifer cover then changed to a subtropical evergreen broadleaved forest distributed around the Nihewan Paleolake. These changes suggest that wetter conditions progressed from western China to the east, and the climate became more humid than that of today indicating a stronger Asian summer monsoon during the early Pleistocene. 展开更多
关键词 早更新世 孢粉记录 湖相沉积物 环境指标 气候带 亚热带常绿阔叶林 柴达木盆地 草原植被
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准噶尔盆地北缘黄花沟地区砂岩型铀矿目的层时代、古气候及铀矿化关系 被引量:4
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作者 王毛毛 毛广振 +2 位作者 季兴开 唐湘飞 陈虹 《铀矿地质》 CAS CSCD 2023年第4期558-568,共11页
准噶尔盆地北缘黄花沟地区地表和深部钻探都发现有较好的砂岩型铀矿化显示,但是其含矿目的层的层位归属仍存在争议。文章在含矿目的层的岩石地层对比的基础上,通过系统采集、分析孢粉样品,研究目的层孢粉组合特征、地质时代及古环境。... 准噶尔盆地北缘黄花沟地区地表和深部钻探都发现有较好的砂岩型铀矿化显示,但是其含矿目的层的层位归属仍存在争议。文章在含矿目的层的岩石地层对比的基础上,通过系统采集、分析孢粉样品,研究目的层孢粉组合特征、地质时代及古环境。结果认为,黄花沟地区含矿目的层的时代为早白垩世早期,具有“双束松粉Pinuspollenites-克拉梭粉Classopollis-周壁粉Perinopollenites”的孢粉组合特征,岩石地层单元属于下白垩统吐谷鲁群。吐谷鲁群沉积期,研究区为亚热带半湿润的古气候;白垩系古气候具有由湿润向干旱转变的特征,所形成红杂色(灰色)碎屑岩建造,应是下一步找矿重点。 展开更多
关键词 孢粉组合 古气候 铀矿化 黄花沟地区 准噶尔盆地
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克拉玛依油田424井2140~3551.63 m井段层序、年代学新证及“盆−山”地层对比 被引量:2
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作者 蒋志斌 黄家瑄 +4 位作者 李永军 李思远 王韬 王杰 彭南赫 《西北地质》 CAS CSCD 北大核心 2023年第2期1-9,共9页
井中地层层序的建立和时代确定,是岩石地层单位划分与对比的关键证据,对正确确立储层意义重大。新疆克拉玛依油田424井上部2140~3178 m井段以海相陆源碎屑岩为主,在井深3176.94~3178.44 m深灰色粉砂岩与灰黑色细砂岩互层中获得了匙叶粉N... 井中地层层序的建立和时代确定,是岩石地层单位划分与对比的关键证据,对正确确立储层意义重大。新疆克拉玛依油田424井上部2140~3178 m井段以海相陆源碎屑岩为主,在井深3176.94~3178.44 m深灰色粉砂岩与灰黑色细砂岩互层中获得了匙叶粉Noeggerathiops−idozonotriletes等孢粉化石,指示其时代属晚石炭世早—中期(Bashkirian−Moscovian)的可能性最大;下部井段3178~3551.63 m以火山角砾岩间夹熔岩为主,在3340.50~3343.50 m杏仁状玄武安山岩获得306 Ma的LA−ICP−MS锆石U−Pb年龄;确认上部陆源碎屑岩与下部火山角砾岩二者为整合接触,二分性特征明显。据此,确认上部层位与424井之北哈拉阿拉特山区阿腊德依克赛组建组剖面下段总体可对比;下部层位与424井之北哈拉阿拉特组上部层位可对比。这一成果细分了424井中岩石地层单位,弥补了这2组在山区原建组剖面“原始接触关系不清,新老关系不明”之不足。 展开更多
关键词 地层层序 孢粉化石 锆石U−Pb年龄 阿腊德依克赛组与哈拉阿拉特组 划分与对比 克拉玛依油田424井
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鄂尔多斯东北部中侏罗世孢粉化石及古气候意义 被引量:3
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作者 黄磊 张晓晶 +6 位作者 李钢柱 季兴开 韩萱 王振义 刘志强 侯泽明 艾子涵 《地质学报》 EI CAS CSCD 北大核心 2023年第5期1390-1406,共17页
鄂尔多斯盆地东北部内蒙古伊金霍洛旗乌兰木伦地区是我国重要的能源矿产地,含煤岩系赋存在侏罗系延安组中,延安组岩石组合以灰白色砂岩、灰色粉砂岩、灰色泥岩为主,夹多层煤层;延安组上覆直罗组以灰色、灰绿色砂岩、灰色粉砂岩、紫红色... 鄂尔多斯盆地东北部内蒙古伊金霍洛旗乌兰木伦地区是我国重要的能源矿产地,含煤岩系赋存在侏罗系延安组中,延安组岩石组合以灰白色砂岩、灰色粉砂岩、灰色泥岩为主,夹多层煤层;延安组上覆直罗组以灰色、灰绿色砂岩、灰色粉砂岩、紫红色泥岩为主。通过对乌兰木伦地区武家塔露天煤矿剖面延安组和直罗组孢粉化石分析,在延安组中识别出Cyathidites-Lycopodiumsporites-Neoraistrickia-Cycadopites孢粉组合带,以桫椤科、石松科孢子繁盛,紫萁科孢子和单沟/原始沟类、松柏类两气囊花粉发育,卷柏科孢子及柏科花粉较常见为主要特征,时代为中侏罗世早期(阿林期—巴柔期)。根据延安组孢粉母体植物的生态环境分析,本区在这一沉积时期的气候属于温暖湿润的亚热带—温带型气候。直罗组孢粉化石较少,主要见Cyathidites minor,Osmundacidites parvus,Concentrisporites fragilis,Cycadopites spp.等。综合地层岩性、孢粉组合及古植被分析,延安组到直罗组沉积时期总体上呈现从温暖湿润的亚热带—温带型向半干旱—干旱炎热型的气候变化过程。 展开更多
关键词 孢粉 中侏罗世 延安组 直罗组 古气候 鄂尔多斯盆地
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